titus.genpy.cast¶

titus.genpy.cast(state, scope, expr, fromType, cases, partial, parser)[source]¶

Helper function for type-safe casting as an expression.

Parameters:	state (titus.genpy.ExecutionState) – exeuction state scope (titus.util.DynamicScope) – dynamic scope object expr (evaluated expression) – object to cast fromType (string) – JSON-serialized Avro type cases (list of (string, string, callable) triples) – list of (new variable for one case, JSON-serialized subtype, function to call if type matches) triples partial (boolean) – if True, allow the set of cases to incompletely cover the fromType parser (titus.datatype.ForwardDeclarationParser) – used to interpret fromType
Return type:	None or result of one of the cases callable
Returns:	if partial, returns None, else returns the result of the matching case